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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034a5dfd8782e3dd3e3b951a1d3a20f7177affdbdf9c26d9d4f4ca6f323c769c' 
  AND token = 'p2j6auBfoQ0cO0mTd6Ng27CVS0SLwTyOe6vkOPPmZqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}